Improvement of the transient stability using SFCL in Korean power systems

• In Korea, the Special Protection System is applied for protecting the power system.
• Hybrid SFCL is protecting the power system from viewpoint of the transient stability.
• Basic hybrid SFCL system cannot recover during the auto-reclosing operation.
• This paper performs analysis of transient stability using the novel hybrid SFCL.

This paper proposed a novel hybrid SFCL system for the enhancement of the transient stability in Korean power transmission system with auto-reclosing operation. The proposed SFCL system has an operation mechanism that the current limiting impedance is eliminated from the power system in a fault clearing time for the enhancement of the transient stability. Also, the system can cover the auto-reclosing operation of the transmission power system. This study analyzed an improvement of the special protection system by applying the proposed SFCL system to real power system in Korea.